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Check: GEN005521

AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE: GEN005521 (in versions v1 r14 through v1 r10)

Title

The SSH daemon must restrict login ability to specific users and/or groups. (Cat II impact)

Discussion

Restricting SSH logins to a limited group of users, such as system administrators, prevents password-guessing and other SSH attacks from reaching system accounts and other accounts not authorized for SSH access.

Check Content

Check the SSH daemon configuration for the AllowGroups setting. # grep -i AllowGroups /etc/ssh/sshd_config | grep -v '^#' If no lines are returned, this is a finding.

Fix Text

Edit the SSH daemon configuration and add an AllowGroups directive.

Additional Identifiers

Rule ID: SV-26763r1_rule

Vulnerability ID: V-22470

Group Title: GEN005521

Expert Comments

Expert comments are only available to logged-in users.

CCIs

CCIs tied to check.

Number	Definition
CCI-000225	The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-6	Least Privilege